BBC AT/30 Attenuator Panel
1960
BBC PAT/3 Portable Attenuator
Attenuator for AKG C28 Microphone (BBC Code AT2/6)
circa 1961
Precision attenuator
1970-1979
High frequency turret attenuator unit type A63
1957
BBC AT2/1 Attenuator Panel
1956
Attenuator type A-301-A
1961